﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Data;
using System.Globalization;
using System.Windows;

namespace Microsoft.Forums.ForumsClient.ThreadedView
{
    /// <summary>
    /// Convert Level to left margin
    /// Pass a prarameter if you want a unit length other than 19.0.
    /// </summary>
    public class LevelToIndentConverter : IValueConverter
    {

        /// <summary>
        /// Convert from the level number to a thickness amount
        /// </summary>
        /// <param name="value">The value produced by the binding source.</param>
        /// <param name="targetType">The type of the binding target property.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return new Thickness((int)value * indentSize, 0, 0, 0);
        }


        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotSupportedException();
        }

        /// <summary>
        /// Our contstan indent size
        /// </summary>
        private const double indentSize = 19.0;
    }
}
